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Date: Wed, 19 Sep 2007 11:34:27 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
GOTO <y-goto@...fujitsu.com>
Subject: Re: [PATCH] fix memory hot remove not configured case.
Sorry... I sent old version...it returns -ENOSYS.
Andrew-san, please replace.
Goto-san, please confirm and ack.
==
Now, arch dependent code around CONFIG_MEMORY_HOTREMOVE is a mess.
This patch cleans up them.
- For !CONFIG_MEMORY_HOTREMOVE, add generic no-op remove_memory(),
which returns -EINVAL.
- removed remove_pages() only used in powerpc.
- removed no-op remove_memory() in i386, sh, sparc64, x86_64.
- only powerpc returns -ENOSYS at memory hot remove. changes it
to return -EINVAL.
Note:
Currently, only ia64 supports CONFIG_MEMORY_HOTREMOVE. I welcome other
archs if there are requirements and testers.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
arch/i386/mm/init.c | 5 ----
arch/ia64/mm/init.c | 3 +-
arch/powerpc/mm/mem.c | 45 -----------------------------------------
arch/sh/mm/init.c | 6 -----
arch/sparc64/mm/init.c | 5 ----
arch/x86_64/mm/init.c | 6 -----
include/linux/memory_hotplug.h | 12 +---------
mm/memory_hotplug.c | 6 +++++
8 files changed, 10 insertions(+), 78 deletions(-)
Index: linux-2.6.23-rc6-mm1/arch/ia64/mm/init.c
===================================================================
--- linux-2.6.23-rc6-mm1.orig/arch/ia64/mm/init.c
+++ linux-2.6.23-rc6-mm1/arch/ia64/mm/init.c
@@ -719,7 +719,7 @@ int arch_add_memory(int nid, u64 start,
return ret;
}
-
+#ifdef CONFIG_MEMORY_HOTREMOVE
int remove_memory(u64 start, u64 size)
{
unsigned long start_pfn, end_pfn;
@@ -735,4 +735,5 @@ out:
return ret;
}
EXPORT_SYMBOL_GPL(remove_memory);
+#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif
Index: linux-2.6.23-rc6-mm1/arch/powerpc/mm/mem.c
===================================================================
--- linux-2.6.23-rc6-mm1.orig/arch/powerpc/mm/mem.c
+++ linux-2.6.23-rc6-mm1/arch/powerpc/mm/mem.c
@@ -129,51 +129,6 @@ int __devinit arch_add_memory(int nid, u
return __add_pages(zone, start_pfn, nr_pages);
}
-/*
- * First pass at this code will check to determine if the remove
- * request is within the RMO. Do not allow removal within the RMO.
- */
-int __devinit remove_memory(u64 start, u64 size)
-{
- struct zone *zone;
- unsigned long start_pfn, end_pfn, nr_pages;
-
- start_pfn = start >> PAGE_SHIFT;
- nr_pages = size >> PAGE_SHIFT;
- end_pfn = start_pfn + nr_pages;
-
- printk("%s(): Attempting to remove memoy in range "
- "%lx to %lx\n", __func__, start, start+size);
- /*
- * check for range within RMO
- */
- zone = page_zone(pfn_to_page(start_pfn));
-
- printk("%s(): memory will be removed from "
- "the %s zone\n", __func__, zone->name);
-
- /*
- * not handling removing memory ranges that
- * overlap multiple zones yet
- */
- if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
- goto overlap;
-
- /* make sure it is NOT in RMO */
- if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) {
- printk("%s(): range to be removed must NOT be in RMO!\n",
- __func__);
- goto in_rmo;
- }
-
- return __remove_pages(zone, start_pfn, nr_pages);
-
-overlap:
- printk("%s(): memory range to be removed overlaps "
- "multiple zones!!!\n", __func__);
-in_rmo:
- return -1;
-}
#endif /* CONFIG_MEMORY_HOTPLUG */
void show_mem(void)
Index: linux-2.6.23-rc6-mm1/arch/x86_64/mm/init.c
===================================================================
--- linux-2.6.23-rc6-mm1.orig/arch/x86_64/mm/init.c
+++ linux-2.6.23-rc6-mm1/arch/x86_64/mm/init.c
@@ -474,12 +474,6 @@ error:
}
EXPORT_SYMBOL_GPL(arch_add_memory);
-int remove_memory(u64 start, u64 size)
-{
- return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(remove_memory);
-
#if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
int memory_add_physaddr_to_nid(u64 start)
{
Index: linux-2.6.23-rc6-mm1/include/linux/memory_hotplug.h
===================================================================
--- linux-2.6.23-rc6-mm1.orig/include/linux/memory_hotplug.h
+++ linux-2.6.23-rc6-mm1/include/linux/memory_hotplug.h
@@ -58,10 +58,9 @@ extern int add_one_highpage(struct page
extern void online_page(struct page *page);
/* VM interface that may be used by firmware interface */
extern int online_pages(unsigned long, unsigned long);
-#ifdef CONFIG_MEMORY_HOTREMOVE
-extern int offline_pages(unsigned long, unsigned long, unsigned long);
extern void __offline_isolated_pages(unsigned long, unsigned long);
-#endif
+extern int offline_pages(unsigned long, unsigned long, unsigned long);
+
/* reasonably generic interface to expand the physical pages in a zone */
extern int __add_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);
@@ -171,13 +170,6 @@ static inline int mhp_notimplemented(con
}
#endif /* ! CONFIG_MEMORY_HOTPLUG */
-static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
- unsigned long nr_pages)
-{
- printk(KERN_WARNING "%s() called, not yet supported\n", __FUNCTION__);
- dump_stack();
- return -ENOSYS;
-}
extern int add_memory(int nid, u64 start, u64 size);
extern int arch_add_memory(int nid, u64 start, u64 size);
Index: linux-2.6.23-rc6-mm1/mm/memory_hotplug.c
===================================================================
--- linux-2.6.23-rc6-mm1.orig/mm/memory_hotplug.c
+++ linux-2.6.23-rc6-mm1/mm/memory_hotplug.c
@@ -555,4 +555,10 @@ failed_removal:
undo_isolate_page_range(start_pfn, end_pfn);
return ret;
}
+#else
+int remove_memory(u64 start, u64 size)
+{
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
#endif /* CONFIG_MEMORY_HOTREMOVE */
Index: linux-2.6.23-rc6-mm1/arch/i386/mm/init.c
===================================================================
--- linux-2.6.23-rc6-mm1.orig/arch/i386/mm/init.c
+++ linux-2.6.23-rc6-mm1/arch/i386/mm/init.c
@@ -735,11 +735,6 @@ int arch_add_memory(int nid, u64 start,
return __add_pages(zone, start_pfn, nr_pages);
}
-int remove_memory(u64 start, u64 size)
-{
- return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(remove_memory);
#endif
struct kmem_cache *pmd_cache;
Index: linux-2.6.23-rc6-mm1/arch/sh/mm/init.c
===================================================================
--- linux-2.6.23-rc6-mm1.orig/arch/sh/mm/init.c
+++ linux-2.6.23-rc6-mm1/arch/sh/mm/init.c
@@ -294,12 +294,6 @@ int arch_add_memory(int nid, u64 start,
}
EXPORT_SYMBOL_GPL(arch_add_memory);
-int remove_memory(u64 start, u64 size)
-{
- return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(remove_memory);
-
#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 addr)
{
Index: linux-2.6.23-rc6-mm1/arch/sparc64/mm/init.c
===================================================================
--- linux-2.6.23-rc6-mm1.orig/arch/sparc64/mm/init.c
+++ linux-2.6.23-rc6-mm1/arch/sparc64/mm/init.c
@@ -1963,9 +1963,4 @@ void online_page(struct page *page)
num_physpages++;
}
-int remove_memory(u64 start, u64 size)
-{
- return -EINVAL;
-}
-
#endif /* CONFIG_MEMORY_HOTPLUG */
-
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